set thread_work_size to 4 for unrolled kernel #154541
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Previous PRs enabling 8-vectorization inadvertently regressed unrolled kernel perf. Pull Request resolved: #152396 Approved by: https://github.com/BoyuanFeng, https://github.com/msaroufim, https://github.com/malfet, https://github.com/Aidyn-A, https://github.com/atalman (cherry picked from commit adebb8b)
This was referenced May 28, 2025
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Previous PRs enabling 8-vectorization inadvertently regressed unrolled kernel perf.
cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @ipiszy @chenyang78 @kadeng @muchulee8 @amjames @chauhang @aakhundov